Drying apparatus.



F. P. W. STIELER. DRYING APPARATUS. APPLICATION FILED 1020. 2a, 1912.

1,079,673. Patented Nov. 25, 1913.

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F1422 l g Ii 6' "r 5%, i *Flaa QiTToR/VE y- COLUMBIA FLANOIIIAPH CO.WAIHINGTON. D. C,

P. F. W. STIELER.

DRYING APPARATUS.

APPLICATION FILED 1120.28, 1912.

Patented Nov. 25, 1913.

WITN E88 E 8 MMMM COLUMBIA PLANoaRAPl-l COUWAFHINOTON D c FRANZFRIEDRICH WILLY STIELER, 0F BERLIN, GERMANY.

DRYING APPARATUS.

Specification of Letters Patent.

Patented Nov. 25, 1913.

Application filed December 28, 1912. Serial No. 739,119.

To all whom it may concern Be it known that I, FRANZ FRIEDRICH VVILLYS'rrnLnR, a subject of the King of Prussia, residing at Berlin, in theKingdom of Prussia and German Empire, have invented certain new anduseful Improvements in Drying Apparatus, of which the following is aspecification.

For the purpose of drying liquids by means of drying drums it is usualeither to allow the drum to dip into the liquid to be dried or to applysaid liquid to the drum by means of rolls, a squirt, or the like. Suchdevices have however not been found to answer the purpose, because theliquid is not uniformly applied to the drum. This drawback is overcomeaccording to the present invention by the liquid being applied by one ormore floats, each of which is arranged in a vessel provided adjacent tothe drying drum.

In the accompanying drawin several constructions of the device areSlOWIl by way of example: Figure 1 representing, in cross section, aconstruction having one float, Fig. 2 a plan of the same, the drum beingshown in dot and dash lines. Fig. 3 is a cross section of a constructionhaving two vessels in each of which a float is provided. Fig. 4 is asimilar section through a device having one float provided with pins,the wall of the Vessel containing said float being pressed against thedrum. Fig. 5 shows a plan of the construction shown in Fig. 4:. Fig. 6,a section through the device shown in Fig. 4 on a larger scale. Fig. 7is a similar section of a modified construction of the device shown inFig. 6. Fig. 8 is an enlarged detail sectional view of the float shownin Figs. 5 and 6, and Fig. 9 is a partial plan View, enlarged, of saidfloat.

In front of the hot drying drum (1, which rotates in the direction ofthe arrow 09, is provided a vessel 6, the trough c of which is suppliedwith liquid from the vessel at through the pipe e. The pipe 6 extendsthroughout the entire width of the vessel near to the bottom thereof,and has a number of perforations opening downward, so that the materialto be dried rises on both sides of the pipe 6 and mixes the liquid inthe vessel d, which liquid accordingly receives a uniform temperature,in spite of the heat taken up unequally from the drum (1.

On the liquid in the trough 0 there is a float f extending along theentire width of the drum a. The float can consist of one or more parts,and can be made of any specially light material, preferably of wood. Theedge 9 presses against the drum a and causes the material to be dried tobe uniformly applied to said drum. Moreover this float renders itimpossible for a skin or froth to be formed, so that the liquid canalways uniformly approach the drum.

According to Fig. 3, the vessel 6 has two troughs c and 0 each of whichis supplied with the material to be dried from a special vessel d dthrough the pipes 6 6 In each of said troughs there is a float f 7. Bythe consecutive action of the two floats f and f a more uniformapplication of the material to the drum is obtained.

In the construction shown in Figs. 47'6, the material to be dried iscontained in a trough h, the wall is of which is made of elastic thinsheet metal, and is adapted to be pressed more or less against said drumby means of the screws Z. By means of'this arrangement a quite uniformpressure of the wall is against the drum (1 is obtained. As thethickness of the layer applied to the drum depends essentially on theintimate contact between said drum and the edge of the wall is, theentire feed to the drum can be rendered very uniform over the entirewidth of the drum by adjusting the pressure of said wall. In order tostill further improve the feed, the float m can be provided with shortpins 11.- along the edge adj acent to the drum. As shown in Figs. 6 and8, the upper edge 0 and the pins 0?. press against the drying drum a.These pins assist in distributing the material passing to the edge 0, sothat a uniform distribution of the liquid is obtained under allconditions. The length of the pins is adjustable, so that withdifl'erent depths of dip of the slide, according to the specific gravityof the liquids in question, the contact of the pins with the drum 1 canbe always maintained. The feed to the trough k is effected, as in theother constructions, through a pipe 79, which communicates with areceiver 9, and extends over the entire width of the trough h. The pipep is also in this case provided with openings directed downward, inorder to maintain a uniform temperature of the liquid in said trough.The float m and the feed pipe p can be connected together, for example,in such a manner that the feed pipe is suspended from the float. Such anarrangement is shown in Fig. 7. This arrangement has the advantage thatthe trough can be quickly and conveniently exposed, for example, forcleaning.

hat I claim and desire to secure by Let ters Patent of the United Statesis 1. In a cylinder evaporator, the combination of a drying drum, avessel adjacent to the periphery of said drum to contain the liquid tobe dried, and a float supported on the liquid in position to feed saidliquid to said drum.

2. In a cylinder evaporator, the combination of a drying drum, a vesselpositioned adjacent the periphery of said drum in position to feedliquid to the latter, and a float supported on the liquid contents ofsaid vessel with an edge in such close proximity to said drum peripheryas to feed said liquid contents to the drum.

3. In a cylinder evaporator, the combination of a drying cylinder, ameans for supporting a liquid supply adjacent the periphery of saidcylinder and a means floated on the liquid in such close proximity tosaid cylinder as to feed said liquid gradually to the latter.

4. In a cylinder evaporator, the combination of a drying drum, a vesseladjacent to said drum containing a liquid to be dried and pressingagainst said drum, a float contained in said vessel, and pins along theedge of said float adjacent to said drum, substantially as, and for thepurpose, set forth.

5. In a cylinder evaporator, the combination of a drying drum, a vesseladjacent to said drying drum, :1 float contained in said vessel, and afeed pipe passing throughout the entire width of said vessel and havingdownwardly directed perforations, substantially as, and for the purpose,set forth.

6. 111 a cylinder evaporator, the combination of a drying drum, a vesseladjacent to said drying drum and adapted to contain a liquid to bedried, a float contained in said vessel, and a pipe extending into saidvessel and adapted to be supported by said float,

substantially as, and for the purpose, set

forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANZ FRIEDRICH WILLY STIELER.

Witnesses:

HENRY HASPER,

WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

